/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the examples of the Qt Toolkit.
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#ifndef NODE_H
#define NODE_H

#include <QGraphicsItem>
#include <QList>
#include <QObject>

class Edge;
class GraphWidget;


QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE

/**
  节点
 * @brief Node::Default_node_width
 */
class Node :public QObject,public QGraphicsItem
{
public:
    Node(GraphWidget *graphWidget);

    QString nodeId; //节点id，16为ascll码
    QString nodeType; //节点类型
    QString nodeInfo;  //节点描述信息

    void addEdge(Edge *edge); //增加连线边，用来表示父子关系
    QList<Edge *> edges() const; //获取节点相关联的所有边

    enum { Type = UserType + 1 };
    int type() const { return Type; }

    void calculateForces();
    bool advance();

    QRectF boundingRect() const;
    QPainterPath shape() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

    static int  Default_node_width;
protected:
    QVariant itemChange(GraphicsItemChange change, const QVariant &value);


    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);

    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
private:

    bool isHover;
    QList<Edge *> edgeList;
    QPointF newPos;
    GraphWidget *graph;
};
//! [0]

#endif
